2009-02-24 18:49:27 +00:00
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/* $OpenBSD: packet.c,v 1.160 2009/02/13 11:50:21 markus Exp $ */
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2000-02-24 14:29:47 +00:00
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* This file contains code implementing the packet protocol and communication
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* with the other side. This same code is used both on client and server side.
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2000-05-15 04:37:24 +00:00
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*
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2000-09-10 08:31:17 +00:00
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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*
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2000-05-15 04:37:24 +00:00
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* SSH2 packet format added by Markus Friedl.
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2002-03-18 09:55:03 +00:00
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* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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2000-05-15 04:37:24 +00:00
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*
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2000-09-10 08:31:17 +00:00
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2000-02-24 14:29:47 +00:00
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*/
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#include "includes.h"
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2006-09-30 13:29:51 +00:00
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#include <sys/types.h>
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2004-01-07 11:10:17 +00:00
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#include "openbsd-compat/sys-queue.h"
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2006-09-30 13:29:51 +00:00
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#include <sys/param.h>
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#include <sys/socket.h>
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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2000-02-24 14:29:47 +00:00
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#include "xmalloc.h"
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#include "buffer.h"
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#include "packet.h"
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#include "crc32.h"
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#include "compress.h"
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#include "deattack.h"
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2000-05-15 04:37:24 +00:00
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#include "channels.h"
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#include "compat.h"
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2001-05-04 03:57:05 +00:00
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#include "ssh1.h"
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2000-05-15 04:37:24 +00:00
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#include "ssh2.h"
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2000-12-05 02:20:19 +00:00
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#include "cipher.h"
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2006-09-30 13:29:51 +00:00
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#include "key.h"
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2000-05-15 04:37:24 +00:00
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#include "kex.h"
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2001-05-04 03:57:05 +00:00
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#include "mac.h"
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#include "log.h"
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#include "canohost.h"
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2002-03-18 09:55:03 +00:00
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#include "misc.h"
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2002-06-23 14:01:54 +00:00
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#include "ssh.h"
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2000-05-15 04:37:24 +00:00
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#ifdef PACKET_DEBUG
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#define DBG(x) x
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#else
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#define DBG(x)
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#endif
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2000-02-24 14:29:47 +00:00
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2009-02-24 18:49:27 +00:00
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#define PACKET_MAX_SIZE (256 * 1024)
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2000-02-24 14:29:47 +00:00
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/*
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* This variable contains the file descriptors used for communicating with
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* the other side. connection_in is used for reading; connection_out for
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* writing. These can be the same descriptor, in which case it is assumed to
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* be a socket.
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*/
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static int connection_in = -1;
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static int connection_out = -1;
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/* Protocol flags for the remote side. */
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2001-05-04 03:57:05 +00:00
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static u_int remote_protocol_flags = 0;
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2000-02-24 14:29:47 +00:00
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/* Encryption context for receiving data. This is only used for decryption. */
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static CipherContext receive_context;
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/* Encryption context for sending data. This is only used for encryption. */
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static CipherContext send_context;
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/* Buffer for raw input data from the socket. */
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2002-06-23 14:01:54 +00:00
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Buffer input;
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2000-02-24 14:29:47 +00:00
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/* Buffer for raw output data going to the socket. */
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2002-06-23 14:01:54 +00:00
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Buffer output;
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2000-02-24 14:29:47 +00:00
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/* Buffer for the partial outgoing packet being constructed. */
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static Buffer outgoing_packet;
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/* Buffer for the incoming packet currently being processed. */
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static Buffer incoming_packet;
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/* Scratch buffer for packet compression/decompression. */
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static Buffer compression_buffer;
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2001-05-04 03:57:05 +00:00
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static int compression_buffer_ready = 0;
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2000-02-24 14:29:47 +00:00
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/* Flag indicating whether packet compression/decompression is enabled. */
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static int packet_compression = 0;
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/* default maximum packet size */
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2004-01-07 11:10:17 +00:00
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u_int max_packet_size = 32768;
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2000-02-24 14:29:47 +00:00
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/* Flag indicating whether this module has been initialized. */
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static int initialized = 0;
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/* Set to true if the connection is interactive. */
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static int interactive_mode = 0;
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2005-09-03 06:59:33 +00:00
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/* Set to true if we are the server side. */
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static int server_side = 0;
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/* Set to true if we are authenticated. */
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static int after_authentication = 0;
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2008-07-23 09:28:49 +00:00
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int keep_alive_timeouts = 0;
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2008-07-23 09:33:08 +00:00
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/* Set to the maximum time that we will wait to send or receive a packet */
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static int packet_timeout_ms = -1;
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2000-05-15 04:37:24 +00:00
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/* Session key information for Encryption and MAC */
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2001-05-04 03:57:05 +00:00
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Newkeys *newkeys[MODE_MAX];
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2004-01-07 11:10:17 +00:00
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static struct packet_state {
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u_int32_t seqnr;
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u_int32_t packets;
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u_int64_t blocks;
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2008-07-23 09:33:08 +00:00
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u_int64_t bytes;
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2004-01-07 11:10:17 +00:00
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} p_read, p_send;
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static u_int64_t max_blocks_in, max_blocks_out;
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static u_int32_t rekey_limit;
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2002-06-23 14:01:54 +00:00
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/* Session key for protocol v1 */
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static u_char ssh1_key[SSH_SESSION_KEY_LENGTH];
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static u_int ssh1_keylen;
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2000-05-15 04:37:24 +00:00
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2002-03-18 09:55:03 +00:00
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/* roundup current message to extra_pad bytes */
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static u_char extra_pad = 0;
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2000-05-15 04:37:24 +00:00
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2009-02-24 18:49:27 +00:00
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/* XXX discard incoming data after MAC error */
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static u_int packet_discard = 0;
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static Mac *packet_discard_mac = NULL;
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2004-01-07 11:10:17 +00:00
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struct packet {
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TAILQ_ENTRY(packet) next;
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u_char type;
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Buffer payload;
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};
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TAILQ_HEAD(, packet) outgoing;
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2000-02-24 14:29:47 +00:00
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/*
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* Sets the descriptors used for communication. Disables encryption until
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* packet_set_encryption_key is called.
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*/
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void
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packet_set_connection(int fd_in, int fd_out)
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{
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2000-12-05 02:20:19 +00:00
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Cipher *none = cipher_by_name("none");
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2002-10-29 09:43:00 +00:00
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2000-12-05 02:20:19 +00:00
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if (none == NULL)
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fatal("packet_set_connection: cannot load cipher 'none'");
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2000-02-24 14:29:47 +00:00
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connection_in = fd_in;
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connection_out = fd_out;
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2004-10-28 16:03:53 +00:00
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cipher_init(&send_context, none, (const u_char *)"",
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0, NULL, 0, CIPHER_ENCRYPT);
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cipher_init(&receive_context, none, (const u_char *)"",
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0, NULL, 0, CIPHER_DECRYPT);
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2002-03-18 09:55:03 +00:00
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newkeys[MODE_IN] = newkeys[MODE_OUT] = NULL;
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2000-02-24 14:29:47 +00:00
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if (!initialized) {
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initialized = 1;
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buffer_init(&input);
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buffer_init(&output);
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buffer_init(&outgoing_packet);
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buffer_init(&incoming_packet);
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2004-01-07 11:10:17 +00:00
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TAILQ_INIT(&outgoing);
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2008-07-23 09:33:08 +00:00
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p_send.packets = p_read.packets = 0;
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}
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}
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void
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packet_set_timeout(int timeout, int count)
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{
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if (timeout == 0 || count == 0) {
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packet_timeout_ms = -1;
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return;
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2000-02-24 14:29:47 +00:00
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}
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2008-07-23 09:33:08 +00:00
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if ((INT_MAX / 1000) / count < timeout)
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packet_timeout_ms = INT_MAX;
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else
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packet_timeout_ms = timeout * count * 1000;
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2000-02-24 14:29:47 +00:00
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}
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2009-02-24 18:49:27 +00:00
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static void
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packet_stop_discard(void)
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{
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if (packet_discard_mac) {
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char buf[1024];
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memset(buf, 'a', sizeof(buf));
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while (buffer_len(&incoming_packet) < PACKET_MAX_SIZE)
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buffer_append(&incoming_packet, buf, sizeof(buf));
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(void) mac_compute(packet_discard_mac,
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p_read.seqnr,
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buffer_ptr(&incoming_packet),
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PACKET_MAX_SIZE);
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}
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logit("Finished discarding for %.200s", get_remote_ipaddr());
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cleanup_exit(255);
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}
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static void
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packet_start_discard(Enc *enc, Mac *mac, u_int packet_length, u_int discard)
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{
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if (enc == NULL || !cipher_is_cbc(enc->cipher))
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packet_disconnect("Packet corrupt");
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if (packet_length != PACKET_MAX_SIZE && mac && mac->enabled)
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packet_discard_mac = mac;
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if (buffer_len(&input) >= discard)
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packet_stop_discard();
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packet_discard = discard - buffer_len(&input);
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}
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2000-02-24 14:29:47 +00:00
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/* Returns 1 if remote host is connected via socket, 0 if not. */
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int
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2002-03-18 09:55:03 +00:00
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packet_connection_is_on_socket(void)
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2000-02-24 14:29:47 +00:00
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{
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struct sockaddr_storage from, to;
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socklen_t fromlen, tolen;
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/* filedescriptors in and out are the same, so it's a socket */
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if (connection_in == connection_out)
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return 1;
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fromlen = sizeof(from);
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memset(&from, 0, sizeof(from));
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if (getpeername(connection_in, (struct sockaddr *)&from, &fromlen) < 0)
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return 0;
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tolen = sizeof(to);
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memset(&to, 0, sizeof(to));
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if (getpeername(connection_out, (struct sockaddr *)&to, &tolen) < 0)
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return 0;
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if (fromlen != tolen || memcmp(&from, &to, fromlen) != 0)
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return 0;
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if (from.ss_family != AF_INET && from.ss_family != AF_INET6)
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return 0;
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return 1;
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}
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2002-06-23 14:01:54 +00:00
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/*
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* Exports an IV from the CipherContext required to export the key
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* state back from the unprivileged child to the privileged parent
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* process.
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*/
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void
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packet_get_keyiv(int mode, u_char *iv, u_int len)
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{
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CipherContext *cc;
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if (mode == MODE_OUT)
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cc = &send_context;
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else
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cc = &receive_context;
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cipher_get_keyiv(cc, iv, len);
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}
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int
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packet_get_keycontext(int mode, u_char *dat)
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{
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CipherContext *cc;
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if (mode == MODE_OUT)
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cc = &send_context;
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else
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cc = &receive_context;
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return (cipher_get_keycontext(cc, dat));
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}
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void
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packet_set_keycontext(int mode, u_char *dat)
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{
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CipherContext *cc;
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if (mode == MODE_OUT)
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cc = &send_context;
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else
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cc = &receive_context;
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cipher_set_keycontext(cc, dat);
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}
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int
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packet_get_keyiv_len(int mode)
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{
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CipherContext *cc;
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if (mode == MODE_OUT)
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cc = &send_context;
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else
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cc = &receive_context;
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return (cipher_get_keyiv_len(cc));
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}
|
2006-09-30 13:29:51 +00:00
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|
2002-06-23 14:01:54 +00:00
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void
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packet_set_iv(int mode, u_char *dat)
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{
|
|
|
|
CipherContext *cc;
|
|
|
|
|
|
|
|
if (mode == MODE_OUT)
|
|
|
|
cc = &send_context;
|
|
|
|
else
|
|
|
|
cc = &receive_context;
|
|
|
|
|
|
|
|
cipher_set_keyiv(cc, dat);
|
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
|
2002-06-23 14:01:54 +00:00
|
|
|
int
|
2004-01-07 11:10:17 +00:00
|
|
|
packet_get_ssh1_cipher(void)
|
2002-06-23 14:01:54 +00:00
|
|
|
{
|
|
|
|
return (cipher_get_number(receive_context.cipher));
|
|
|
|
}
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
void
|
2008-07-23 09:33:08 +00:00
|
|
|
packet_get_state(int mode, u_int32_t *seqnr, u_int64_t *blocks, u_int32_t *packets,
|
|
|
|
u_int64_t *bytes)
|
2002-06-23 14:01:54 +00:00
|
|
|
{
|
2004-01-07 11:10:17 +00:00
|
|
|
struct packet_state *state;
|
|
|
|
|
|
|
|
state = (mode == MODE_IN) ? &p_read : &p_send;
|
2008-07-23 09:33:08 +00:00
|
|
|
if (seqnr)
|
|
|
|
*seqnr = state->seqnr;
|
|
|
|
if (blocks)
|
|
|
|
*blocks = state->blocks;
|
|
|
|
if (packets)
|
|
|
|
*packets = state->packets;
|
|
|
|
if (bytes)
|
|
|
|
*bytes = state->bytes;
|
2002-06-23 14:01:54 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
2008-07-23 09:33:08 +00:00
|
|
|
packet_set_state(int mode, u_int32_t seqnr, u_int64_t blocks, u_int32_t packets,
|
|
|
|
u_int64_t bytes)
|
2002-06-23 14:01:54 +00:00
|
|
|
{
|
2004-01-07 11:10:17 +00:00
|
|
|
struct packet_state *state;
|
|
|
|
|
|
|
|
state = (mode == MODE_IN) ? &p_read : &p_send;
|
|
|
|
state->seqnr = seqnr;
|
|
|
|
state->blocks = blocks;
|
|
|
|
state->packets = packets;
|
2008-07-23 09:33:08 +00:00
|
|
|
state->bytes = bytes;
|
2002-06-23 14:01:54 +00:00
|
|
|
}
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/* returns 1 if connection is via ipv4 */
|
|
|
|
|
|
|
|
int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_connection_is_ipv4(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
struct sockaddr_storage to;
|
|
|
|
socklen_t tolen = sizeof(to);
|
|
|
|
|
|
|
|
memset(&to, 0, sizeof(to));
|
|
|
|
if (getsockname(connection_out, (struct sockaddr *)&to, &tolen) < 0)
|
|
|
|
return 0;
|
2002-06-27 22:31:32 +00:00
|
|
|
if (to.ss_family == AF_INET)
|
|
|
|
return 1;
|
|
|
|
#ifdef IPV4_IN_IPV6
|
2004-02-26 10:38:49 +00:00
|
|
|
if (to.ss_family == AF_INET6 &&
|
2002-06-27 22:31:32 +00:00
|
|
|
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr))
|
|
|
|
return 1;
|
|
|
|
#endif
|
|
|
|
return 0;
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Sets the connection into non-blocking mode. */
|
|
|
|
|
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_set_nonblocking(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
/* Set the socket into non-blocking mode. */
|
2004-10-28 16:03:53 +00:00
|
|
|
set_nonblock(connection_in);
|
2000-02-24 14:29:47 +00:00
|
|
|
|
2004-10-28 16:03:53 +00:00
|
|
|
if (connection_out != connection_in)
|
|
|
|
set_nonblock(connection_out);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Returns the socket used for reading. */
|
|
|
|
|
|
|
|
int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_get_connection_in(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
return connection_in;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Returns the descriptor used for writing. */
|
|
|
|
|
|
|
|
int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_get_connection_out(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
return connection_out;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Closes the connection and clears and frees internal data structures. */
|
|
|
|
|
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_close(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
if (!initialized)
|
|
|
|
return;
|
|
|
|
initialized = 0;
|
|
|
|
if (connection_in == connection_out) {
|
|
|
|
shutdown(connection_out, SHUT_RDWR);
|
|
|
|
close(connection_out);
|
|
|
|
} else {
|
|
|
|
close(connection_in);
|
|
|
|
close(connection_out);
|
|
|
|
}
|
|
|
|
buffer_free(&input);
|
|
|
|
buffer_free(&output);
|
|
|
|
buffer_free(&outgoing_packet);
|
|
|
|
buffer_free(&incoming_packet);
|
2001-05-04 03:57:05 +00:00
|
|
|
if (compression_buffer_ready) {
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_free(&compression_buffer);
|
|
|
|
buffer_compress_uninit();
|
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
cipher_cleanup(&send_context);
|
|
|
|
cipher_cleanup(&receive_context);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Sets remote side protocol flags. */
|
|
|
|
|
|
|
|
void
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_set_protocol_flags(u_int protocol_flags)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
remote_protocol_flags = protocol_flags;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Returns the remote protocol flags set earlier by the above function. */
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
u_int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_get_protocol_flags(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
return remote_protocol_flags;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Starts packet compression from the next packet on in both directions.
|
|
|
|
* Level is compression level 1 (fastest) - 9 (slow, best) as in gzip.
|
|
|
|
*/
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static void
|
|
|
|
packet_init_compression(void)
|
2001-05-04 03:57:05 +00:00
|
|
|
{
|
|
|
|
if (compression_buffer_ready == 1)
|
|
|
|
return;
|
|
|
|
compression_buffer_ready = 1;
|
|
|
|
buffer_init(&compression_buffer);
|
|
|
|
}
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
void
|
|
|
|
packet_start_compression(int level)
|
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
if (packet_compression && !compat20)
|
2000-02-24 14:29:47 +00:00
|
|
|
fatal("Compression already enabled.");
|
|
|
|
packet_compression = 1;
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_init_compression();
|
|
|
|
buffer_compress_init_send(level);
|
|
|
|
buffer_compress_init_recv();
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Causes any further packets to be encrypted using the given key. The same
|
|
|
|
* key is used for both sending and reception. However, both directions are
|
|
|
|
* encrypted independently of each other.
|
|
|
|
*/
|
2002-06-23 14:01:54 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
void
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_set_encryption_key(const u_char *key, u_int keylen,
|
2000-12-05 02:20:19 +00:00
|
|
|
int number)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
2000-12-05 02:20:19 +00:00
|
|
|
Cipher *cipher = cipher_by_number(number);
|
2002-10-29 09:43:00 +00:00
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
if (cipher == NULL)
|
|
|
|
fatal("packet_set_encryption_key: unknown cipher number %d", number);
|
2000-05-15 04:37:24 +00:00
|
|
|
if (keylen < 20)
|
2000-12-05 02:20:19 +00:00
|
|
|
fatal("packet_set_encryption_key: keylen too small: %d", keylen);
|
2002-06-23 14:01:54 +00:00
|
|
|
if (keylen > SSH_SESSION_KEY_LENGTH)
|
|
|
|
fatal("packet_set_encryption_key: keylen too big: %d", keylen);
|
|
|
|
memcpy(ssh1_key, key, keylen);
|
|
|
|
ssh1_keylen = keylen;
|
2002-03-18 09:55:03 +00:00
|
|
|
cipher_init(&send_context, cipher, key, keylen, NULL, 0, CIPHER_ENCRYPT);
|
|
|
|
cipher_init(&receive_context, cipher, key, keylen, NULL, 0, CIPHER_DECRYPT);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
2002-06-23 14:01:54 +00:00
|
|
|
u_int
|
|
|
|
packet_get_encryption_key(u_char *key)
|
|
|
|
{
|
|
|
|
if (key == NULL)
|
|
|
|
return (ssh1_keylen);
|
|
|
|
memcpy(key, ssh1_key, ssh1_keylen);
|
|
|
|
return (ssh1_keylen);
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
/* Start constructing a packet to send. */
|
2000-05-15 04:37:24 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_start(u_char type)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
u_char buf[9];
|
|
|
|
int len;
|
2000-05-15 04:37:24 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
DBG(debug("packet_start[%d]", type));
|
2002-03-18 09:55:03 +00:00
|
|
|
len = compat20 ? 6 : 9;
|
|
|
|
memset(buf, 0, len - 1);
|
|
|
|
buf[len - 1] = type;
|
|
|
|
buffer_clear(&outgoing_packet);
|
|
|
|
buffer_append(&outgoing_packet, buf, len);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
/* Append payload. */
|
2000-02-24 14:29:47 +00:00
|
|
|
void
|
|
|
|
packet_put_char(int value)
|
|
|
|
{
|
|
|
|
char ch = value;
|
2002-10-29 09:43:00 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_append(&outgoing_packet, &ch, 1);
|
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
void
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_put_int(u_int value)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
buffer_put_int(&outgoing_packet, value);
|
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_put_string(const void *buf, u_int len)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
buffer_put_string(&outgoing_packet, buf, len);
|
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
void
|
|
|
|
packet_put_cstring(const char *str)
|
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_put_cstring(&outgoing_packet, str);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_put_raw(const void *buf, u_int len)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
|
|
|
buffer_append(&outgoing_packet, buf, len);
|
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
void
|
|
|
|
packet_put_bignum(BIGNUM * value)
|
|
|
|
{
|
|
|
|
buffer_put_bignum(&outgoing_packet, value);
|
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
void
|
|
|
|
packet_put_bignum2(BIGNUM * value)
|
|
|
|
{
|
|
|
|
buffer_put_bignum2(&outgoing_packet, value);
|
|
|
|
}
|
2000-02-24 14:29:47 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Finalizes and sends the packet. If the encryption key has been set,
|
|
|
|
* encrypts the packet before sending.
|
|
|
|
*/
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static void
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_send1(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
u_char buf[8], *cp;
|
2000-02-24 14:29:47 +00:00
|
|
|
int i, padding, len;
|
2001-05-04 03:57:05 +00:00
|
|
|
u_int checksum;
|
2004-10-28 16:03:53 +00:00
|
|
|
u_int32_t rnd = 0;
|
2000-02-24 14:29:47 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* If using packet compression, compress the payload of the outgoing
|
|
|
|
* packet.
|
|
|
|
*/
|
|
|
|
if (packet_compression) {
|
|
|
|
buffer_clear(&compression_buffer);
|
|
|
|
/* Skip padding. */
|
|
|
|
buffer_consume(&outgoing_packet, 8);
|
|
|
|
/* padding */
|
|
|
|
buffer_append(&compression_buffer, "\0\0\0\0\0\0\0\0", 8);
|
|
|
|
buffer_compress(&outgoing_packet, &compression_buffer);
|
|
|
|
buffer_clear(&outgoing_packet);
|
|
|
|
buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer),
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_len(&compression_buffer));
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
/* Compute packet length without padding (add checksum, remove padding). */
|
|
|
|
len = buffer_len(&outgoing_packet) + 4 - 8;
|
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
/* Insert padding. Initialized to zero in packet_start1() */
|
2000-02-24 14:29:47 +00:00
|
|
|
padding = 8 - len % 8;
|
2002-03-18 09:55:03 +00:00
|
|
|
if (!send_context.plaintext) {
|
2000-02-24 14:29:47 +00:00
|
|
|
cp = buffer_ptr(&outgoing_packet);
|
|
|
|
for (i = 0; i < padding; i++) {
|
|
|
|
if (i % 4 == 0)
|
2004-10-28 16:03:53 +00:00
|
|
|
rnd = arc4random();
|
|
|
|
cp[7 - i] = rnd & 0xff;
|
|
|
|
rnd >>= 8;
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
buffer_consume(&outgoing_packet, 8 - padding);
|
|
|
|
|
|
|
|
/* Add check bytes. */
|
2002-03-18 09:55:03 +00:00
|
|
|
checksum = ssh_crc32(buffer_ptr(&outgoing_packet),
|
2000-09-10 08:31:17 +00:00
|
|
|
buffer_len(&outgoing_packet));
|
2006-09-30 13:29:51 +00:00
|
|
|
put_u32(buf, checksum);
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_append(&outgoing_packet, buf, 4);
|
|
|
|
|
|
|
|
#ifdef PACKET_DEBUG
|
|
|
|
fprintf(stderr, "packet_send plain: ");
|
|
|
|
buffer_dump(&outgoing_packet);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Append to output. */
|
2006-09-30 13:29:51 +00:00
|
|
|
put_u32(buf, len);
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_append(&output, buf, 4);
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = buffer_append_space(&output, buffer_len(&outgoing_packet));
|
|
|
|
cipher_crypt(&send_context, cp, buffer_ptr(&outgoing_packet),
|
|
|
|
buffer_len(&outgoing_packet));
|
2000-02-24 14:29:47 +00:00
|
|
|
|
|
|
|
#ifdef PACKET_DEBUG
|
|
|
|
fprintf(stderr, "encrypted: ");
|
|
|
|
buffer_dump(&output);
|
|
|
|
#endif
|
2008-07-23 09:33:08 +00:00
|
|
|
p_send.packets++;
|
|
|
|
p_send.bytes += len + buffer_len(&outgoing_packet);
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_clear(&outgoing_packet);
|
|
|
|
|
|
|
|
/*
|
2006-03-22 19:46:12 +00:00
|
|
|
* Note that the packet is now only buffered in output. It won't be
|
2000-02-24 14:29:47 +00:00
|
|
|
* actually sent until packet_write_wait or packet_write_poll is
|
|
|
|
* called.
|
|
|
|
*/
|
|
|
|
}
|
|
|
|
|
2002-06-23 14:01:54 +00:00
|
|
|
void
|
2001-05-04 03:57:05 +00:00
|
|
|
set_newkeys(int mode)
|
|
|
|
{
|
|
|
|
Enc *enc;
|
|
|
|
Mac *mac;
|
|
|
|
Comp *comp;
|
|
|
|
CipherContext *cc;
|
2004-01-07 11:10:17 +00:00
|
|
|
u_int64_t *max_blocks;
|
2004-10-28 16:03:53 +00:00
|
|
|
int crypt_type;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2003-04-23 16:53:02 +00:00
|
|
|
debug2("set_newkeys: mode %d", mode);
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
if (mode == MODE_OUT) {
|
|
|
|
cc = &send_context;
|
2004-10-28 16:03:53 +00:00
|
|
|
crypt_type = CIPHER_ENCRYPT;
|
2004-01-07 11:10:17 +00:00
|
|
|
p_send.packets = p_send.blocks = 0;
|
|
|
|
max_blocks = &max_blocks_out;
|
2002-03-18 09:55:03 +00:00
|
|
|
} else {
|
|
|
|
cc = &receive_context;
|
2004-10-28 16:03:53 +00:00
|
|
|
crypt_type = CIPHER_DECRYPT;
|
2004-01-07 11:10:17 +00:00
|
|
|
p_read.packets = p_read.blocks = 0;
|
|
|
|
max_blocks = &max_blocks_in;
|
2002-03-18 09:55:03 +00:00
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
if (newkeys[mode] != NULL) {
|
2003-04-23 16:53:02 +00:00
|
|
|
debug("set_newkeys: rekeying");
|
2002-03-18 09:55:03 +00:00
|
|
|
cipher_cleanup(cc);
|
2001-05-04 03:57:05 +00:00
|
|
|
enc = &newkeys[mode]->enc;
|
|
|
|
mac = &newkeys[mode]->mac;
|
|
|
|
comp = &newkeys[mode]->comp;
|
2008-07-23 09:23:42 +00:00
|
|
|
mac_clear(mac);
|
2001-05-04 03:57:05 +00:00
|
|
|
xfree(enc->name);
|
|
|
|
xfree(enc->iv);
|
|
|
|
xfree(enc->key);
|
|
|
|
xfree(mac->name);
|
|
|
|
xfree(mac->key);
|
|
|
|
xfree(comp->name);
|
|
|
|
xfree(newkeys[mode]);
|
|
|
|
}
|
|
|
|
newkeys[mode] = kex_get_newkeys(mode);
|
|
|
|
if (newkeys[mode] == NULL)
|
|
|
|
fatal("newkeys: no keys for mode %d", mode);
|
|
|
|
enc = &newkeys[mode]->enc;
|
|
|
|
mac = &newkeys[mode]->mac;
|
|
|
|
comp = &newkeys[mode]->comp;
|
2008-07-23 09:23:42 +00:00
|
|
|
if (mac_init(mac) == 0)
|
2001-05-04 03:57:05 +00:00
|
|
|
mac->enabled = 1;
|
|
|
|
DBG(debug("cipher_init_context: %d", mode));
|
2002-03-18 09:55:03 +00:00
|
|
|
cipher_init(cc, enc->cipher, enc->key, enc->key_len,
|
2004-10-28 16:03:53 +00:00
|
|
|
enc->iv, enc->block_size, crypt_type);
|
2002-06-23 14:01:54 +00:00
|
|
|
/* Deleting the keys does not gain extra security */
|
|
|
|
/* memset(enc->iv, 0, enc->block_size);
|
2008-07-23 09:23:42 +00:00
|
|
|
memset(enc->key, 0, enc->key_len);
|
|
|
|
memset(mac->key, 0, mac->key_len); */
|
2005-09-03 06:59:33 +00:00
|
|
|
if ((comp->type == COMP_ZLIB ||
|
|
|
|
(comp->type == COMP_DELAYED && after_authentication)) &&
|
|
|
|
comp->enabled == 0) {
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_init_compression();
|
|
|
|
if (mode == MODE_OUT)
|
|
|
|
buffer_compress_init_send(6);
|
|
|
|
else
|
|
|
|
buffer_compress_init_recv();
|
|
|
|
comp->enabled = 1;
|
|
|
|
}
|
2004-01-07 11:10:17 +00:00
|
|
|
/*
|
|
|
|
* The 2^(blocksize*2) limit is too expensive for 3DES,
|
|
|
|
* blowfish, etc, so enforce a 1GB limit for small blocksizes.
|
|
|
|
*/
|
|
|
|
if (enc->block_size >= 16)
|
|
|
|
*max_blocks = (u_int64_t)1 << (enc->block_size*2);
|
|
|
|
else
|
|
|
|
*max_blocks = ((u_int64_t)1 << 30) / enc->block_size;
|
|
|
|
if (rekey_limit)
|
|
|
|
*max_blocks = MIN(*max_blocks, rekey_limit / enc->block_size);
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
|
2005-09-03 06:59:33 +00:00
|
|
|
/*
|
|
|
|
* Delayed compression for SSH2 is enabled after authentication:
|
2006-09-30 13:29:51 +00:00
|
|
|
* This happens on the server side after a SSH2_MSG_USERAUTH_SUCCESS is sent,
|
2005-09-03 06:59:33 +00:00
|
|
|
* and on the client side after a SSH2_MSG_USERAUTH_SUCCESS is received.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
packet_enable_delayed_compress(void)
|
|
|
|
{
|
|
|
|
Comp *comp = NULL;
|
|
|
|
int mode;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Remember that we are past the authentication step, so rekeying
|
|
|
|
* with COMP_DELAYED will turn on compression immediately.
|
|
|
|
*/
|
|
|
|
after_authentication = 1;
|
|
|
|
for (mode = 0; mode < MODE_MAX; mode++) {
|
2006-09-30 13:29:51 +00:00
|
|
|
/* protocol error: USERAUTH_SUCCESS received before NEWKEYS */
|
|
|
|
if (newkeys[mode] == NULL)
|
|
|
|
continue;
|
2005-09-03 06:59:33 +00:00
|
|
|
comp = &newkeys[mode]->comp;
|
|
|
|
if (comp && !comp->enabled && comp->type == COMP_DELAYED) {
|
|
|
|
packet_init_compression();
|
|
|
|
if (mode == MODE_OUT)
|
|
|
|
buffer_compress_init_send(6);
|
|
|
|
else
|
|
|
|
buffer_compress_init_recv();
|
|
|
|
comp->enabled = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
/*
|
|
|
|
* Finalize packet in SSH2 format (compress, mac, encrypt, enqueue)
|
|
|
|
*/
|
2002-03-18 09:55:03 +00:00
|
|
|
static void
|
2004-01-07 11:10:17 +00:00
|
|
|
packet_send2_wrapped(void)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
u_char type, *cp, *macbuf = NULL;
|
|
|
|
u_char padlen, pad;
|
2001-05-04 03:57:05 +00:00
|
|
|
u_int packet_length = 0;
|
2002-03-18 09:55:03 +00:00
|
|
|
u_int i, len;
|
2004-10-28 16:03:53 +00:00
|
|
|
u_int32_t rnd = 0;
|
2000-05-15 04:37:24 +00:00
|
|
|
Enc *enc = NULL;
|
|
|
|
Mac *mac = NULL;
|
|
|
|
Comp *comp = NULL;
|
|
|
|
int block_size;
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
if (newkeys[MODE_OUT] != NULL) {
|
|
|
|
enc = &newkeys[MODE_OUT]->enc;
|
|
|
|
mac = &newkeys[MODE_OUT]->mac;
|
|
|
|
comp = &newkeys[MODE_OUT]->comp;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
block_size = enc ? enc->block_size : 8;
|
2000-05-15 04:37:24 +00:00
|
|
|
|
|
|
|
cp = buffer_ptr(&outgoing_packet);
|
2002-03-18 09:55:03 +00:00
|
|
|
type = cp[5];
|
2000-05-15 04:37:24 +00:00
|
|
|
|
|
|
|
#ifdef PACKET_DEBUG
|
|
|
|
fprintf(stderr, "plain: ");
|
|
|
|
buffer_dump(&outgoing_packet);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
if (comp && comp->enabled) {
|
|
|
|
len = buffer_len(&outgoing_packet);
|
|
|
|
/* skip header, compress only payload */
|
|
|
|
buffer_consume(&outgoing_packet, 5);
|
|
|
|
buffer_clear(&compression_buffer);
|
|
|
|
buffer_compress(&outgoing_packet, &compression_buffer);
|
|
|
|
buffer_clear(&outgoing_packet);
|
|
|
|
buffer_append(&outgoing_packet, "\0\0\0\0\0", 5);
|
|
|
|
buffer_append(&outgoing_packet, buffer_ptr(&compression_buffer),
|
|
|
|
buffer_len(&compression_buffer));
|
|
|
|
DBG(debug("compression: raw %d compressed %d", len,
|
|
|
|
buffer_len(&outgoing_packet)));
|
|
|
|
}
|
|
|
|
|
|
|
|
/* sizeof (packet_len + pad_len + payload) */
|
|
|
|
len = buffer_len(&outgoing_packet);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* calc size of padding, alloc space, get random data,
|
|
|
|
* minimum padding is 4 bytes
|
|
|
|
*/
|
|
|
|
padlen = block_size - (len % block_size);
|
|
|
|
if (padlen < 4)
|
|
|
|
padlen += block_size;
|
2002-03-18 09:55:03 +00:00
|
|
|
if (extra_pad) {
|
|
|
|
/* will wrap if extra_pad+padlen > 255 */
|
|
|
|
extra_pad = roundup(extra_pad, block_size);
|
|
|
|
pad = extra_pad - ((len + padlen) % extra_pad);
|
2002-06-23 14:01:54 +00:00
|
|
|
debug3("packet_send2: adding %d (len %d padlen %d extra_pad %d)",
|
2002-03-18 09:55:03 +00:00
|
|
|
pad, len, padlen, extra_pad);
|
|
|
|
padlen += pad;
|
|
|
|
extra_pad = 0;
|
|
|
|
}
|
|
|
|
cp = buffer_append_space(&outgoing_packet, padlen);
|
|
|
|
if (enc && !send_context.plaintext) {
|
2000-05-15 04:37:24 +00:00
|
|
|
/* random padding */
|
|
|
|
for (i = 0; i < padlen; i++) {
|
|
|
|
if (i % 4 == 0)
|
2004-10-28 16:03:53 +00:00
|
|
|
rnd = arc4random();
|
|
|
|
cp[i] = rnd & 0xff;
|
|
|
|
rnd >>= 8;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* clear padding */
|
|
|
|
memset(cp, 0, padlen);
|
|
|
|
}
|
|
|
|
/* packet_length includes payload, padding and padding length field */
|
|
|
|
packet_length = buffer_len(&outgoing_packet) - 4;
|
|
|
|
cp = buffer_ptr(&outgoing_packet);
|
2006-09-30 13:29:51 +00:00
|
|
|
put_u32(cp, packet_length);
|
2002-03-18 09:55:03 +00:00
|
|
|
cp[4] = padlen;
|
2000-05-15 04:37:24 +00:00
|
|
|
DBG(debug("send: len %d (includes padlen %d)", packet_length+4, padlen));
|
|
|
|
|
|
|
|
/* compute MAC over seqnr and packet(length fields, payload, padding) */
|
|
|
|
if (mac && mac->enabled) {
|
2004-01-07 11:10:17 +00:00
|
|
|
macbuf = mac_compute(mac, p_send.seqnr,
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_ptr(&outgoing_packet),
|
2001-05-04 03:57:05 +00:00
|
|
|
buffer_len(&outgoing_packet));
|
2004-01-07 11:10:17 +00:00
|
|
|
DBG(debug("done calc MAC out #%d", p_send.seqnr));
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
/* encrypt packet and append to output buffer. */
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = buffer_append_space(&output, buffer_len(&outgoing_packet));
|
|
|
|
cipher_crypt(&send_context, cp, buffer_ptr(&outgoing_packet),
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_len(&outgoing_packet));
|
|
|
|
/* append unencrypted MAC */
|
|
|
|
if (mac && mac->enabled)
|
2006-09-30 13:29:51 +00:00
|
|
|
buffer_append(&output, macbuf, mac->mac_len);
|
2000-05-15 04:37:24 +00:00
|
|
|
#ifdef PACKET_DEBUG
|
|
|
|
fprintf(stderr, "encrypted: ");
|
|
|
|
buffer_dump(&output);
|
|
|
|
#endif
|
|
|
|
/* increment sequence number for outgoing packets */
|
2004-01-07 11:10:17 +00:00
|
|
|
if (++p_send.seqnr == 0)
|
|
|
|
logit("outgoing seqnr wraps around");
|
|
|
|
if (++p_send.packets == 0)
|
|
|
|
if (!(datafellows & SSH_BUG_NOREKEY))
|
|
|
|
fatal("XXX too many packets with same key");
|
|
|
|
p_send.blocks += (packet_length + 4) / block_size;
|
2008-07-23 09:33:08 +00:00
|
|
|
p_send.bytes += packet_length + 4;
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_clear(&outgoing_packet);
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
if (type == SSH2_MSG_NEWKEYS)
|
|
|
|
set_newkeys(MODE_OUT);
|
2005-09-03 06:59:33 +00:00
|
|
|
else if (type == SSH2_MSG_USERAUTH_SUCCESS && server_side)
|
|
|
|
packet_enable_delayed_compress();
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
static void
|
|
|
|
packet_send2(void)
|
|
|
|
{
|
|
|
|
static int rekeying = 0;
|
|
|
|
struct packet *p;
|
|
|
|
u_char type, *cp;
|
|
|
|
|
|
|
|
cp = buffer_ptr(&outgoing_packet);
|
|
|
|
type = cp[5];
|
|
|
|
|
|
|
|
/* during rekeying we can only send key exchange messages */
|
|
|
|
if (rekeying) {
|
|
|
|
if (!((type >= SSH2_MSG_TRANSPORT_MIN) &&
|
|
|
|
(type <= SSH2_MSG_TRANSPORT_MAX))) {
|
|
|
|
debug("enqueue packet: %u", type);
|
|
|
|
p = xmalloc(sizeof(*p));
|
|
|
|
p->type = type;
|
|
|
|
memcpy(&p->payload, &outgoing_packet, sizeof(Buffer));
|
|
|
|
buffer_init(&outgoing_packet);
|
|
|
|
TAILQ_INSERT_TAIL(&outgoing, p, next);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* rekeying starts with sending KEXINIT */
|
|
|
|
if (type == SSH2_MSG_KEXINIT)
|
|
|
|
rekeying = 1;
|
|
|
|
|
|
|
|
packet_send2_wrapped();
|
|
|
|
|
|
|
|
/* after a NEWKEYS message we can send the complete queue */
|
|
|
|
if (type == SSH2_MSG_NEWKEYS) {
|
|
|
|
rekeying = 0;
|
|
|
|
while ((p = TAILQ_FIRST(&outgoing))) {
|
|
|
|
type = p->type;
|
|
|
|
debug("dequeue packet: %u", type);
|
|
|
|
buffer_free(&outgoing_packet);
|
|
|
|
memcpy(&outgoing_packet, &p->payload,
|
|
|
|
sizeof(Buffer));
|
|
|
|
TAILQ_REMOVE(&outgoing, p, next);
|
|
|
|
xfree(p);
|
|
|
|
packet_send2_wrapped();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_send(void)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
if (compat20)
|
2000-05-15 04:37:24 +00:00
|
|
|
packet_send2();
|
|
|
|
else
|
|
|
|
packet_send1();
|
|
|
|
DBG(debug("packet_send done"));
|
|
|
|
}
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/*
|
|
|
|
* Waits until a packet has been received, and returns its type. Note that
|
|
|
|
* no other data is processed until this returns, so this function should not
|
|
|
|
* be used during the interactive session.
|
|
|
|
*/
|
|
|
|
|
|
|
|
int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_read_seqnr(u_int32_t *seqnr_p)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
2008-07-23 09:33:08 +00:00
|
|
|
int type, len, ret, ms_remain;
|
2001-05-04 03:57:05 +00:00
|
|
|
fd_set *setp;
|
2000-02-24 14:29:47 +00:00
|
|
|
char buf[8192];
|
2008-07-23 09:33:08 +00:00
|
|
|
struct timeval timeout, start, *timeoutp = NULL;
|
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
DBG(debug("packet_read()"));
|
2000-02-24 14:29:47 +00:00
|
|
|
|
2006-09-30 13:29:51 +00:00
|
|
|
setp = (fd_set *)xcalloc(howmany(connection_in+1, NFDBITS),
|
2001-05-04 03:57:05 +00:00
|
|
|
sizeof(fd_mask));
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/* Since we are blocking, ensure that all written packets have been sent. */
|
|
|
|
packet_write_wait();
|
|
|
|
|
|
|
|
/* Stay in the loop until we have received a complete packet. */
|
|
|
|
for (;;) {
|
|
|
|
/* Try to read a packet from the buffer. */
|
2002-03-18 09:55:03 +00:00
|
|
|
type = packet_read_poll_seqnr(seqnr_p);
|
|
|
|
if (!compat20 && (
|
2000-05-15 04:37:24 +00:00
|
|
|
type == SSH_SMSG_SUCCESS
|
2000-02-24 14:29:47 +00:00
|
|
|
|| type == SSH_SMSG_FAILURE
|
|
|
|
|| type == SSH_CMSG_EOF
|
2000-05-15 04:37:24 +00:00
|
|
|
|| type == SSH_CMSG_EXIT_CONFIRMATION))
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_check_eom();
|
2000-02-24 14:29:47 +00:00
|
|
|
/* If we got a packet, return it. */
|
2001-05-04 03:57:05 +00:00
|
|
|
if (type != SSH_MSG_NONE) {
|
|
|
|
xfree(setp);
|
2000-02-24 14:29:47 +00:00
|
|
|
return type;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2000-02-24 14:29:47 +00:00
|
|
|
/*
|
|
|
|
* Otherwise, wait for some data to arrive, add it to the
|
|
|
|
* buffer, and try again.
|
|
|
|
*/
|
2001-05-04 03:57:05 +00:00
|
|
|
memset(setp, 0, howmany(connection_in + 1, NFDBITS) *
|
|
|
|
sizeof(fd_mask));
|
|
|
|
FD_SET(connection_in, setp);
|
2000-02-24 14:29:47 +00:00
|
|
|
|
2008-07-23 09:33:08 +00:00
|
|
|
if (packet_timeout_ms > 0) {
|
|
|
|
ms_remain = packet_timeout_ms;
|
|
|
|
timeoutp = &timeout;
|
|
|
|
}
|
2000-02-24 14:29:47 +00:00
|
|
|
/* Wait for some data to arrive. */
|
2008-07-23 09:33:08 +00:00
|
|
|
for (;;) {
|
|
|
|
if (packet_timeout_ms != -1) {
|
|
|
|
ms_to_timeval(&timeout, ms_remain);
|
|
|
|
gettimeofday(&start, NULL);
|
|
|
|
}
|
|
|
|
if ((ret = select(connection_in + 1, setp, NULL,
|
|
|
|
NULL, timeoutp)) >= 0)
|
|
|
|
break;
|
|
|
|
if (errno != EAGAIN && errno != EINTR &&
|
|
|
|
errno != EWOULDBLOCK)
|
|
|
|
break;
|
|
|
|
if (packet_timeout_ms == -1)
|
|
|
|
continue;
|
|
|
|
ms_subtract_diff(&start, &ms_remain);
|
|
|
|
if (ms_remain <= 0) {
|
|
|
|
ret = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (ret == 0) {
|
|
|
|
logit("Connection to %.200s timed out while "
|
|
|
|
"waiting to read", get_remote_ipaddr());
|
|
|
|
cleanup_exit(255);
|
|
|
|
}
|
2000-02-24 14:29:47 +00:00
|
|
|
/* Read data from the socket. */
|
|
|
|
len = read(connection_in, buf, sizeof(buf));
|
|
|
|
if (len == 0) {
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("Connection closed by %.200s", get_remote_ipaddr());
|
2004-02-26 10:38:49 +00:00
|
|
|
cleanup_exit(255);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
if (len < 0)
|
|
|
|
fatal("Read from socket failed: %.100s", strerror(errno));
|
|
|
|
/* Append it to the buffer. */
|
|
|
|
packet_process_incoming(buf, len);
|
|
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
int
|
|
|
|
packet_read(void)
|
|
|
|
{
|
|
|
|
return packet_read_seqnr(NULL);
|
|
|
|
}
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/*
|
|
|
|
* Waits until a packet has been received, verifies that its type matches
|
|
|
|
* that given, and gives a fatal error and exits if there is a mismatch.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_read_expect(int expected_type)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
int type;
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
type = packet_read();
|
2000-02-24 14:29:47 +00:00
|
|
|
if (type != expected_type)
|
|
|
|
packet_disconnect("Protocol error: expected packet type %d, got %d",
|
2000-05-15 04:37:24 +00:00
|
|
|
expected_type, type);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Checks if a full packet is available in the data received so far via
|
|
|
|
* packet_process_incoming. If so, reads the packet; otherwise returns
|
|
|
|
* SSH_MSG_NONE. This does not wait for data from the connection.
|
|
|
|
*
|
|
|
|
* SSH_MSG_DISCONNECT is handled specially here. Also,
|
|
|
|
* SSH_MSG_IGNORE messages are skipped by this function and are never returned
|
|
|
|
* to higher levels.
|
|
|
|
*/
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static int
|
|
|
|
packet_read_poll1(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
u_int len, padded_len;
|
2002-03-18 09:55:03 +00:00
|
|
|
u_char *cp, type;
|
2001-05-04 03:57:05 +00:00
|
|
|
u_int checksum, stored_checksum;
|
2000-02-24 14:29:47 +00:00
|
|
|
|
|
|
|
/* Check if input size is less than minimum packet size. */
|
|
|
|
if (buffer_len(&input) < 4 + 8)
|
|
|
|
return SSH_MSG_NONE;
|
|
|
|
/* Get length of incoming packet. */
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = buffer_ptr(&input);
|
2006-09-30 13:29:51 +00:00
|
|
|
len = get_u32(cp);
|
2000-02-24 14:29:47 +00:00
|
|
|
if (len < 1 + 2 + 2 || len > 256 * 1024)
|
2003-04-23 16:53:02 +00:00
|
|
|
packet_disconnect("Bad packet length %u.", len);
|
2000-02-24 14:29:47 +00:00
|
|
|
padded_len = (len + 8) & ~7;
|
|
|
|
|
|
|
|
/* Check if the packet has been entirely received. */
|
|
|
|
if (buffer_len(&input) < 4 + padded_len)
|
|
|
|
return SSH_MSG_NONE;
|
|
|
|
|
|
|
|
/* The entire packet is in buffer. */
|
|
|
|
|
|
|
|
/* Consume packet length. */
|
|
|
|
buffer_consume(&input, 4);
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
/*
|
|
|
|
* Cryptographic attack detector for ssh
|
|
|
|
* (C)1998 CORE-SDI, Buenos Aires Argentina
|
|
|
|
* Ariel Futoransky(futo@core-sdi.com)
|
|
|
|
*/
|
2006-09-30 13:29:51 +00:00
|
|
|
if (!receive_context.plaintext) {
|
|
|
|
switch (detect_attack(buffer_ptr(&input), padded_len)) {
|
|
|
|
case DEATTACK_DETECTED:
|
|
|
|
packet_disconnect("crc32 compensation attack: "
|
|
|
|
"network attack detected");
|
|
|
|
case DEATTACK_DOS_DETECTED:
|
|
|
|
packet_disconnect("deattack denial of "
|
|
|
|
"service detected");
|
|
|
|
}
|
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
|
|
|
|
/* Decrypt data to incoming_packet. */
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_clear(&incoming_packet);
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = buffer_append_space(&incoming_packet, padded_len);
|
|
|
|
cipher_crypt(&receive_context, cp, buffer_ptr(&input), padded_len);
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_consume(&input, padded_len);
|
|
|
|
|
|
|
|
#ifdef PACKET_DEBUG
|
|
|
|
fprintf(stderr, "read_poll plain: ");
|
|
|
|
buffer_dump(&incoming_packet);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/* Compute packet checksum. */
|
2002-03-18 09:55:03 +00:00
|
|
|
checksum = ssh_crc32(buffer_ptr(&incoming_packet),
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_len(&incoming_packet) - 4);
|
2000-02-24 14:29:47 +00:00
|
|
|
|
|
|
|
/* Skip padding. */
|
|
|
|
buffer_consume(&incoming_packet, 8 - len % 8);
|
|
|
|
|
|
|
|
/* Test check bytes. */
|
|
|
|
if (len != buffer_len(&incoming_packet))
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_disconnect("packet_read_poll1: len %d != buffer_len %d.",
|
2000-05-15 04:37:24 +00:00
|
|
|
len, buffer_len(&incoming_packet));
|
2000-02-24 14:29:47 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = (u_char *)buffer_ptr(&incoming_packet) + len - 4;
|
2006-09-30 13:29:51 +00:00
|
|
|
stored_checksum = get_u32(cp);
|
2000-02-24 14:29:47 +00:00
|
|
|
if (checksum != stored_checksum)
|
|
|
|
packet_disconnect("Corrupted check bytes on input.");
|
|
|
|
buffer_consume_end(&incoming_packet, 4);
|
|
|
|
|
|
|
|
if (packet_compression) {
|
|
|
|
buffer_clear(&compression_buffer);
|
|
|
|
buffer_uncompress(&incoming_packet, &compression_buffer);
|
|
|
|
buffer_clear(&incoming_packet);
|
|
|
|
buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_len(&compression_buffer));
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
2008-07-23 09:33:08 +00:00
|
|
|
p_read.packets++;
|
|
|
|
p_read.bytes += padded_len + 4;
|
2002-03-18 09:55:03 +00:00
|
|
|
type = buffer_get_char(&incoming_packet);
|
2005-06-05 15:40:50 +00:00
|
|
|
if (type < SSH_MSG_MIN || type > SSH_MSG_MAX)
|
|
|
|
packet_disconnect("Invalid ssh1 packet type: %d", type);
|
2002-03-18 09:55:03 +00:00
|
|
|
return type;
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static int
|
|
|
|
packet_read_poll2(u_int32_t *seqnr_p)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
static u_int packet_length = 0;
|
|
|
|
u_int padlen, need;
|
2002-03-18 09:55:03 +00:00
|
|
|
u_char *macbuf, *cp, type;
|
2005-09-03 06:59:33 +00:00
|
|
|
u_int maclen, block_size;
|
2000-05-15 04:37:24 +00:00
|
|
|
Enc *enc = NULL;
|
|
|
|
Mac *mac = NULL;
|
|
|
|
Comp *comp = NULL;
|
|
|
|
|
2009-02-24 18:49:27 +00:00
|
|
|
if (packet_discard)
|
|
|
|
return SSH_MSG_NONE;
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
if (newkeys[MODE_IN] != NULL) {
|
|
|
|
enc = &newkeys[MODE_IN]->enc;
|
|
|
|
mac = &newkeys[MODE_IN]->mac;
|
|
|
|
comp = &newkeys[MODE_IN]->comp;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
maclen = mac && mac->enabled ? mac->mac_len : 0;
|
2002-03-18 09:55:03 +00:00
|
|
|
block_size = enc ? enc->block_size : 8;
|
2000-05-15 04:37:24 +00:00
|
|
|
|
|
|
|
if (packet_length == 0) {
|
|
|
|
/*
|
|
|
|
* check if input size is less than the cipher block size,
|
|
|
|
* decrypt first block and extract length of incoming packet
|
|
|
|
*/
|
|
|
|
if (buffer_len(&input) < block_size)
|
|
|
|
return SSH_MSG_NONE;
|
|
|
|
buffer_clear(&incoming_packet);
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = buffer_append_space(&incoming_packet, block_size);
|
|
|
|
cipher_crypt(&receive_context, cp, buffer_ptr(&input),
|
2000-05-15 04:37:24 +00:00
|
|
|
block_size);
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = buffer_ptr(&incoming_packet);
|
2006-09-30 13:29:51 +00:00
|
|
|
packet_length = get_u32(cp);
|
2009-02-24 18:49:27 +00:00
|
|
|
if (packet_length < 1 + 4 || packet_length > PACKET_MAX_SIZE) {
|
2004-01-07 11:10:17 +00:00
|
|
|
#ifdef PACKET_DEBUG
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_dump(&incoming_packet);
|
2004-01-07 11:10:17 +00:00
|
|
|
#endif
|
2009-02-24 18:49:27 +00:00
|
|
|
logit("Bad packet length %u.", packet_length);
|
|
|
|
packet_start_discard(enc, mac, packet_length,
|
|
|
|
PACKET_MAX_SIZE);
|
|
|
|
return SSH_MSG_NONE;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2003-04-23 16:53:02 +00:00
|
|
|
DBG(debug("input: packet len %u", packet_length+4));
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_consume(&input, block_size);
|
|
|
|
}
|
|
|
|
/* we have a partial packet of block_size bytes */
|
|
|
|
need = 4 + packet_length - block_size;
|
|
|
|
DBG(debug("partial packet %d, need %d, maclen %d", block_size,
|
|
|
|
need, maclen));
|
2009-02-24 18:49:27 +00:00
|
|
|
if (need % block_size != 0) {
|
|
|
|
logit("padding error: need %d block %d mod %d",
|
2000-05-15 04:37:24 +00:00
|
|
|
need, block_size, need % block_size);
|
2009-02-24 18:49:27 +00:00
|
|
|
packet_start_discard(enc, mac, packet_length,
|
|
|
|
PACKET_MAX_SIZE - block_size);
|
|
|
|
return SSH_MSG_NONE;
|
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
/*
|
|
|
|
* check if the entire packet has been received and
|
|
|
|
* decrypt into incoming_packet
|
|
|
|
*/
|
|
|
|
if (buffer_len(&input) < need + maclen)
|
|
|
|
return SSH_MSG_NONE;
|
|
|
|
#ifdef PACKET_DEBUG
|
|
|
|
fprintf(stderr, "read_poll enc/full: ");
|
|
|
|
buffer_dump(&input);
|
|
|
|
#endif
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = buffer_append_space(&incoming_packet, need);
|
|
|
|
cipher_crypt(&receive_context, cp, buffer_ptr(&input), need);
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_consume(&input, need);
|
|
|
|
/*
|
|
|
|
* compute MAC over seqnr and packet,
|
|
|
|
* increment sequence number for incoming packet
|
|
|
|
*/
|
|
|
|
if (mac && mac->enabled) {
|
2004-01-07 11:10:17 +00:00
|
|
|
macbuf = mac_compute(mac, p_read.seqnr,
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_ptr(&incoming_packet),
|
2001-05-04 03:57:05 +00:00
|
|
|
buffer_len(&incoming_packet));
|
2009-02-24 18:49:27 +00:00
|
|
|
if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0) {
|
|
|
|
logit("Corrupted MAC on input.");
|
|
|
|
if (need > PACKET_MAX_SIZE)
|
|
|
|
fatal("internal error need %d", need);
|
|
|
|
packet_start_discard(enc, mac, packet_length,
|
|
|
|
PACKET_MAX_SIZE - need);
|
|
|
|
return SSH_MSG_NONE;
|
|
|
|
}
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
DBG(debug("MAC #%d ok", p_read.seqnr));
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_consume(&input, mac->mac_len);
|
|
|
|
}
|
2009-02-24 18:49:27 +00:00
|
|
|
/* XXX now it's safe to use fatal/packet_disconnect */
|
2002-03-18 09:55:03 +00:00
|
|
|
if (seqnr_p != NULL)
|
2004-01-07 11:10:17 +00:00
|
|
|
*seqnr_p = p_read.seqnr;
|
|
|
|
if (++p_read.seqnr == 0)
|
|
|
|
logit("incoming seqnr wraps around");
|
|
|
|
if (++p_read.packets == 0)
|
|
|
|
if (!(datafellows & SSH_BUG_NOREKEY))
|
|
|
|
fatal("XXX too many packets with same key");
|
|
|
|
p_read.blocks += (packet_length + 4) / block_size;
|
2008-07-23 09:33:08 +00:00
|
|
|
p_read.bytes += packet_length + 4;
|
2000-05-15 04:37:24 +00:00
|
|
|
|
|
|
|
/* get padlen */
|
2002-03-18 09:55:03 +00:00
|
|
|
cp = buffer_ptr(&incoming_packet);
|
|
|
|
padlen = cp[4];
|
2000-05-15 04:37:24 +00:00
|
|
|
DBG(debug("input: padlen %d", padlen));
|
|
|
|
if (padlen < 4)
|
|
|
|
packet_disconnect("Corrupted padlen %d on input.", padlen);
|
|
|
|
|
|
|
|
/* skip packet size + padlen, discard padding */
|
|
|
|
buffer_consume(&incoming_packet, 4 + 1);
|
|
|
|
buffer_consume_end(&incoming_packet, padlen);
|
|
|
|
|
|
|
|
DBG(debug("input: len before de-compress %d", buffer_len(&incoming_packet)));
|
|
|
|
if (comp && comp->enabled) {
|
|
|
|
buffer_clear(&compression_buffer);
|
|
|
|
buffer_uncompress(&incoming_packet, &compression_buffer);
|
|
|
|
buffer_clear(&incoming_packet);
|
|
|
|
buffer_append(&incoming_packet, buffer_ptr(&compression_buffer),
|
|
|
|
buffer_len(&compression_buffer));
|
2002-10-29 09:43:00 +00:00
|
|
|
DBG(debug("input: len after de-compress %d",
|
|
|
|
buffer_len(&incoming_packet)));
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
/*
|
|
|
|
* get packet type, implies consume.
|
|
|
|
* return length of payload (without type field)
|
|
|
|
*/
|
2002-03-18 09:55:03 +00:00
|
|
|
type = buffer_get_char(&incoming_packet);
|
2005-06-05 15:40:50 +00:00
|
|
|
if (type < SSH2_MSG_MIN || type >= SSH2_MSG_LOCAL_MIN)
|
|
|
|
packet_disconnect("Invalid ssh2 packet type: %d", type);
|
2001-05-04 03:57:05 +00:00
|
|
|
if (type == SSH2_MSG_NEWKEYS)
|
|
|
|
set_newkeys(MODE_IN);
|
2005-09-03 06:59:33 +00:00
|
|
|
else if (type == SSH2_MSG_USERAUTH_SUCCESS && !server_side)
|
|
|
|
packet_enable_delayed_compress();
|
2000-05-15 04:37:24 +00:00
|
|
|
#ifdef PACKET_DEBUG
|
2001-05-04 03:57:05 +00:00
|
|
|
fprintf(stderr, "read/plain[%d]:\r\n", type);
|
2000-05-15 04:37:24 +00:00
|
|
|
buffer_dump(&incoming_packet);
|
|
|
|
#endif
|
2002-03-18 09:55:03 +00:00
|
|
|
/* reset for next packet */
|
|
|
|
packet_length = 0;
|
|
|
|
return type;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_read_poll_seqnr(u_int32_t *seqnr_p)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2002-06-29 11:34:13 +00:00
|
|
|
u_int reason, seqnr;
|
2002-03-18 09:55:03 +00:00
|
|
|
u_char type;
|
2000-05-15 04:37:24 +00:00
|
|
|
char *msg;
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
for (;;) {
|
|
|
|
if (compat20) {
|
|
|
|
type = packet_read_poll2(seqnr_p);
|
2008-07-23 09:33:08 +00:00
|
|
|
if (type) {
|
|
|
|
keep_alive_timeouts = 0;
|
2000-05-15 04:37:24 +00:00
|
|
|
DBG(debug("received packet type %d", type));
|
2008-07-23 09:33:08 +00:00
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
switch (type) {
|
2000-05-15 04:37:24 +00:00
|
|
|
case SSH2_MSG_IGNORE:
|
2008-07-23 09:28:49 +00:00
|
|
|
debug3("Received SSH2_MSG_IGNORE");
|
2000-05-15 04:37:24 +00:00
|
|
|
break;
|
|
|
|
case SSH2_MSG_DEBUG:
|
|
|
|
packet_get_char();
|
|
|
|
msg = packet_get_string(NULL);
|
|
|
|
debug("Remote: %.900s", msg);
|
|
|
|
xfree(msg);
|
|
|
|
msg = packet_get_string(NULL);
|
|
|
|
xfree(msg);
|
|
|
|
break;
|
|
|
|
case SSH2_MSG_DISCONNECT:
|
|
|
|
reason = packet_get_int();
|
|
|
|
msg = packet_get_string(NULL);
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("Received disconnect from %s: %u: %.400s",
|
2002-06-29 11:34:13 +00:00
|
|
|
get_remote_ipaddr(), reason, msg);
|
2000-05-15 04:37:24 +00:00
|
|
|
xfree(msg);
|
2004-02-26 10:38:49 +00:00
|
|
|
cleanup_exit(255);
|
2000-05-15 04:37:24 +00:00
|
|
|
break;
|
2002-03-18 09:55:03 +00:00
|
|
|
case SSH2_MSG_UNIMPLEMENTED:
|
|
|
|
seqnr = packet_get_int();
|
2002-06-29 11:34:13 +00:00
|
|
|
debug("Received SSH2_MSG_UNIMPLEMENTED for %u",
|
|
|
|
seqnr);
|
2002-03-18 09:55:03 +00:00
|
|
|
break;
|
2000-05-15 04:37:24 +00:00
|
|
|
default:
|
|
|
|
return type;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
} else {
|
2002-03-18 09:55:03 +00:00
|
|
|
type = packet_read_poll1();
|
|
|
|
switch (type) {
|
2000-05-15 04:37:24 +00:00
|
|
|
case SSH_MSG_IGNORE:
|
|
|
|
break;
|
|
|
|
case SSH_MSG_DEBUG:
|
|
|
|
msg = packet_get_string(NULL);
|
|
|
|
debug("Remote: %.900s", msg);
|
|
|
|
xfree(msg);
|
|
|
|
break;
|
|
|
|
case SSH_MSG_DISCONNECT:
|
|
|
|
msg = packet_get_string(NULL);
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("Received disconnect from %s: %.400s",
|
2002-06-29 11:34:13 +00:00
|
|
|
get_remote_ipaddr(), msg);
|
2004-02-26 10:38:49 +00:00
|
|
|
cleanup_exit(255);
|
2000-05-15 04:37:24 +00:00
|
|
|
break;
|
|
|
|
default:
|
2002-03-18 09:55:03 +00:00
|
|
|
if (type)
|
2000-05-15 04:37:24 +00:00
|
|
|
DBG(debug("received packet type %d", type));
|
|
|
|
return type;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
int
|
|
|
|
packet_read_poll(void)
|
|
|
|
{
|
|
|
|
return packet_read_poll_seqnr(NULL);
|
|
|
|
}
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/*
|
|
|
|
* Buffers the given amount of input characters. This is intended to be used
|
|
|
|
* together with packet_read_poll.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_process_incoming(const char *buf, u_int len)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
2009-02-24 18:49:27 +00:00
|
|
|
if (packet_discard) {
|
|
|
|
keep_alive_timeouts = 0; /* ?? */
|
|
|
|
if (len >= packet_discard)
|
|
|
|
packet_stop_discard();
|
|
|
|
packet_discard -= len;
|
|
|
|
return;
|
|
|
|
}
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_append(&input, buf, len);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Returns a character from the packet. */
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
u_int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_get_char(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
char ch;
|
2002-10-29 09:43:00 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_get(&incoming_packet, &ch, 1);
|
2001-05-04 03:57:05 +00:00
|
|
|
return (u_char) ch;
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Returns an integer from the packet data. */
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
u_int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_get_int(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
return buffer_get_int(&incoming_packet);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Returns an arbitrary precision integer from the packet data. The integer
|
|
|
|
* must have been initialized before this call.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_get_bignum(BIGNUM * value)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_get_bignum(&incoming_packet, value);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_get_bignum2(BIGNUM * value)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
buffer_get_bignum2(&incoming_packet, value);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
void *
|
2005-09-03 06:59:33 +00:00
|
|
|
packet_get_raw(u_int *length_ptr)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2005-09-03 06:59:33 +00:00
|
|
|
u_int bytes = buffer_len(&incoming_packet);
|
2002-10-29 09:43:00 +00:00
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
if (length_ptr != NULL)
|
|
|
|
*length_ptr = bytes;
|
|
|
|
return buffer_ptr(&incoming_packet);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
packet_remaining(void)
|
|
|
|
{
|
|
|
|
return buffer_len(&incoming_packet);
|
|
|
|
}
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/*
|
|
|
|
* Returns a string from the packet data. The string is allocated using
|
|
|
|
* xmalloc; it is the responsibility of the calling program to free it when
|
|
|
|
* no longer needed. The length_ptr argument may be NULL, or point to an
|
|
|
|
* integer into which the length of the string is stored.
|
|
|
|
*/
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
void *
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_get_string(u_int *length_ptr)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
return buffer_get_string(&incoming_packet, length_ptr);
|
|
|
|
}
|
|
|
|
|
2008-07-23 09:33:08 +00:00
|
|
|
void *
|
|
|
|
packet_get_string_ptr(u_int *length_ptr)
|
|
|
|
{
|
|
|
|
return buffer_get_string_ptr(&incoming_packet, length_ptr);
|
|
|
|
}
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/*
|
|
|
|
* Sends a diagnostic message from the server to the client. This message
|
|
|
|
* can be sent at any time (but not while constructing another message). The
|
|
|
|
* message is printed immediately, but only if the client is being executed
|
|
|
|
* in verbose mode. These messages are primarily intended to ease debugging
|
|
|
|
* authentication problems. The length of the formatted message must not
|
|
|
|
* exceed 1024 bytes. This will automatically call packet_write_wait.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void
|
|
|
|
packet_send_debug(const char *fmt,...)
|
|
|
|
{
|
|
|
|
char buf[1024];
|
|
|
|
va_list args;
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
if (compat20 && (datafellows & SSH_BUG_DEBUG))
|
|
|
|
return;
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
va_start(args, fmt);
|
|
|
|
vsnprintf(buf, sizeof(buf), fmt, args);
|
|
|
|
va_end(args);
|
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
if (compat20) {
|
|
|
|
packet_start(SSH2_MSG_DEBUG);
|
|
|
|
packet_put_char(0); /* bool: always display */
|
|
|
|
packet_put_cstring(buf);
|
|
|
|
packet_put_cstring("");
|
|
|
|
} else {
|
|
|
|
packet_start(SSH_MSG_DEBUG);
|
|
|
|
packet_put_cstring(buf);
|
|
|
|
}
|
2000-02-24 14:29:47 +00:00
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Logs the error plus constructs and sends a disconnect packet, closes the
|
|
|
|
* connection, and exits. This function never returns. The error message
|
|
|
|
* should not contain a newline. The length of the formatted message must
|
|
|
|
* not exceed 1024 bytes.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void
|
|
|
|
packet_disconnect(const char *fmt,...)
|
|
|
|
{
|
|
|
|
char buf[1024];
|
|
|
|
va_list args;
|
|
|
|
static int disconnecting = 0;
|
2002-10-29 09:43:00 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
if (disconnecting) /* Guard against recursive invocations. */
|
|
|
|
fatal("packet_disconnect called recursively.");
|
|
|
|
disconnecting = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Format the message. Note that the caller must make sure the
|
|
|
|
* message is of limited size.
|
|
|
|
*/
|
|
|
|
va_start(args, fmt);
|
|
|
|
vsnprintf(buf, sizeof(buf), fmt, args);
|
|
|
|
va_end(args);
|
|
|
|
|
2003-04-23 16:53:02 +00:00
|
|
|
/* Display the error locally */
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("Disconnecting: %.100s", buf);
|
2003-04-23 16:53:02 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/* Send the disconnect message to the other side, and wait for it to get sent. */
|
2000-05-15 04:37:24 +00:00
|
|
|
if (compat20) {
|
|
|
|
packet_start(SSH2_MSG_DISCONNECT);
|
|
|
|
packet_put_int(SSH2_DISCONNECT_PROTOCOL_ERROR);
|
|
|
|
packet_put_cstring(buf);
|
|
|
|
packet_put_cstring("");
|
|
|
|
} else {
|
|
|
|
packet_start(SSH_MSG_DISCONNECT);
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_put_cstring(buf);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2000-02-24 14:29:47 +00:00
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
|
|
|
|
/* Stop listening for connections. */
|
2002-03-18 09:55:03 +00:00
|
|
|
channel_close_all();
|
2000-02-24 14:29:47 +00:00
|
|
|
|
|
|
|
/* Close the connection. */
|
|
|
|
packet_close();
|
2004-02-26 10:38:49 +00:00
|
|
|
cleanup_exit(255);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Checks if there is any buffered output, and tries to write some of the output. */
|
|
|
|
|
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_write_poll(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
int len = buffer_len(&output);
|
2002-10-29 09:43:00 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
if (len > 0) {
|
|
|
|
len = write(connection_out, buffer_ptr(&output), len);
|
2008-07-23 09:33:08 +00:00
|
|
|
if (len == -1) {
|
|
|
|
if (errno == EINTR || errno == EAGAIN ||
|
|
|
|
errno == EWOULDBLOCK)
|
2000-02-24 14:29:47 +00:00
|
|
|
return;
|
2008-07-23 09:33:08 +00:00
|
|
|
fatal("Write failed: %.100s", strerror(errno));
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
2008-07-23 09:33:08 +00:00
|
|
|
if (len == 0)
|
|
|
|
fatal("Write connection closed");
|
2000-02-24 14:29:47 +00:00
|
|
|
buffer_consume(&output, len);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-07-23 09:33:08 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/*
|
|
|
|
* Calls packet_write_poll repeatedly until all pending output data has been
|
|
|
|
* written.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_write_wait(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
fd_set *setp;
|
2008-07-23 09:33:08 +00:00
|
|
|
int ret, ms_remain;
|
|
|
|
struct timeval start, timeout, *timeoutp = NULL;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2006-09-30 13:29:51 +00:00
|
|
|
setp = (fd_set *)xcalloc(howmany(connection_out + 1, NFDBITS),
|
2001-05-04 03:57:05 +00:00
|
|
|
sizeof(fd_mask));
|
2000-02-24 14:29:47 +00:00
|
|
|
packet_write_poll();
|
|
|
|
while (packet_have_data_to_write()) {
|
2001-05-04 03:57:05 +00:00
|
|
|
memset(setp, 0, howmany(connection_out + 1, NFDBITS) *
|
|
|
|
sizeof(fd_mask));
|
|
|
|
FD_SET(connection_out, setp);
|
2008-07-23 09:33:08 +00:00
|
|
|
|
|
|
|
if (packet_timeout_ms > 0) {
|
|
|
|
ms_remain = packet_timeout_ms;
|
|
|
|
timeoutp = &timeout;
|
|
|
|
}
|
|
|
|
for (;;) {
|
|
|
|
if (packet_timeout_ms != -1) {
|
|
|
|
ms_to_timeval(&timeout, ms_remain);
|
|
|
|
gettimeofday(&start, NULL);
|
|
|
|
}
|
|
|
|
if ((ret = select(connection_out + 1, NULL, setp,
|
|
|
|
NULL, timeoutp)) >= 0)
|
|
|
|
break;
|
|
|
|
if (errno != EAGAIN && errno != EINTR &&
|
|
|
|
errno != EWOULDBLOCK)
|
|
|
|
break;
|
|
|
|
if (packet_timeout_ms == -1)
|
|
|
|
continue;
|
|
|
|
ms_subtract_diff(&start, &ms_remain);
|
|
|
|
if (ms_remain <= 0) {
|
|
|
|
ret = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (ret == 0) {
|
|
|
|
logit("Connection to %.200s timed out while "
|
|
|
|
"waiting to write", get_remote_ipaddr());
|
|
|
|
cleanup_exit(255);
|
|
|
|
}
|
2000-02-24 14:29:47 +00:00
|
|
|
packet_write_poll();
|
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
xfree(setp);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Returns true if there is buffered data to write to the connection. */
|
|
|
|
|
|
|
|
int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_have_data_to_write(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
return buffer_len(&output) != 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Returns true if there is not too much data to write to the connection. */
|
|
|
|
|
|
|
|
int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_not_very_much_data_to_write(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
if (interactive_mode)
|
|
|
|
return buffer_len(&output) < 16384;
|
|
|
|
else
|
|
|
|
return buffer_len(&output) < 128 * 1024;
|
|
|
|
}
|
|
|
|
|
2004-01-07 11:10:17 +00:00
|
|
|
|
2003-04-23 16:53:02 +00:00
|
|
|
static void
|
|
|
|
packet_set_tos(int interactive)
|
|
|
|
{
|
2004-02-26 10:38:49 +00:00
|
|
|
#if defined(IP_TOS) && !defined(IP_TOS_IS_BROKEN)
|
2003-04-23 16:53:02 +00:00
|
|
|
int tos = interactive ? IPTOS_LOWDELAY : IPTOS_THROUGHPUT;
|
|
|
|
|
|
|
|
if (!packet_connection_is_on_socket() ||
|
|
|
|
!packet_connection_is_ipv4())
|
|
|
|
return;
|
|
|
|
if (setsockopt(connection_in, IPPROTO_IP, IP_TOS, &tos,
|
|
|
|
sizeof(tos)) < 0)
|
|
|
|
error("setsockopt IP_TOS %d: %.100s:",
|
|
|
|
tos, strerror(errno));
|
2004-01-07 11:10:17 +00:00
|
|
|
#endif
|
2004-02-26 10:38:49 +00:00
|
|
|
}
|
2003-04-23 16:53:02 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/* Informs that the current session is interactive. Sets IP flags for that. */
|
|
|
|
|
|
|
|
void
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_set_interactive(int interactive)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
static int called = 0;
|
2000-02-24 14:29:47 +00:00
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
if (called)
|
|
|
|
return;
|
|
|
|
called = 1;
|
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
/* Record that we are in interactive mode. */
|
|
|
|
interactive_mode = interactive;
|
|
|
|
|
|
|
|
/* Only set socket options if using a socket. */
|
|
|
|
if (!packet_connection_is_on_socket())
|
2003-06-24 19:30:44 +00:00
|
|
|
return;
|
2006-09-30 13:29:51 +00:00
|
|
|
set_nodelay(connection_in);
|
2003-04-23 16:53:02 +00:00
|
|
|
packet_set_tos(interactive);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Returns true if the current connection is interactive. */
|
|
|
|
|
|
|
|
int
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_is_interactive(void)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
return interactive_mode;
|
|
|
|
}
|
|
|
|
|
2004-10-28 16:03:53 +00:00
|
|
|
int
|
2004-01-07 11:10:17 +00:00
|
|
|
packet_set_maxsize(u_int s)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
static int called = 0;
|
2002-10-29 09:43:00 +00:00
|
|
|
|
2000-02-24 14:29:47 +00:00
|
|
|
if (called) {
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("packet_set_maxsize: called twice: old %d new %d",
|
2000-05-15 04:37:24 +00:00
|
|
|
max_packet_size, s);
|
2000-02-24 14:29:47 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (s < 4 * 1024 || s > 1024 * 1024) {
|
2004-01-07 11:10:17 +00:00
|
|
|
logit("packet_set_maxsize: bad size %d", s);
|
2000-02-24 14:29:47 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2002-03-18 09:55:03 +00:00
|
|
|
called = 1;
|
|
|
|
debug("packet_set_maxsize: setting to %d", s);
|
2000-02-24 14:29:47 +00:00
|
|
|
max_packet_size = s;
|
|
|
|
return s;
|
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
/* roundup current message to pad bytes */
|
|
|
|
void
|
|
|
|
packet_add_padding(u_char pad)
|
|
|
|
{
|
|
|
|
extra_pad = pad;
|
|
|
|
}
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
/*
|
|
|
|
* 9.2. Ignored Data Message
|
|
|
|
*
|
|
|
|
* byte SSH_MSG_IGNORE
|
|
|
|
* string data
|
|
|
|
*
|
|
|
|
* All implementations MUST understand (and ignore) this message at any
|
|
|
|
* time (after receiving the protocol version). No implementation is
|
|
|
|
* required to send them. This message can be used as an additional
|
|
|
|
* protection measure against advanced traffic analysis techniques.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
packet_send_ignore(int nbytes)
|
|
|
|
{
|
2004-10-28 16:03:53 +00:00
|
|
|
u_int32_t rnd = 0;
|
2001-05-04 03:57:05 +00:00
|
|
|
int i;
|
|
|
|
|
|
|
|
packet_start(compat20 ? SSH2_MSG_IGNORE : SSH_MSG_IGNORE);
|
|
|
|
packet_put_int(nbytes);
|
2002-03-18 09:55:03 +00:00
|
|
|
for (i = 0; i < nbytes; i++) {
|
2001-05-04 03:57:05 +00:00
|
|
|
if (i % 4 == 0)
|
2004-10-28 16:03:53 +00:00
|
|
|
rnd = arc4random();
|
2006-09-30 13:29:51 +00:00
|
|
|
packet_put_char((u_char)rnd & 0xff);
|
2004-10-28 16:03:53 +00:00
|
|
|
rnd >>= 8;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
}
|
2004-01-07 11:10:17 +00:00
|
|
|
|
2004-10-28 16:03:53 +00:00
|
|
|
#define MAX_PACKETS (1U<<31)
|
2004-01-07 11:10:17 +00:00
|
|
|
int
|
|
|
|
packet_need_rekeying(void)
|
|
|
|
{
|
|
|
|
if (datafellows & SSH_BUG_NOREKEY)
|
|
|
|
return 0;
|
|
|
|
return
|
|
|
|
(p_send.packets > MAX_PACKETS) ||
|
|
|
|
(p_read.packets > MAX_PACKETS) ||
|
|
|
|
(max_blocks_out && (p_send.blocks > max_blocks_out)) ||
|
|
|
|
(max_blocks_in && (p_read.blocks > max_blocks_in));
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
packet_set_rekey_limit(u_int32_t bytes)
|
|
|
|
{
|
|
|
|
rekey_limit = bytes;
|
|
|
|
}
|
2005-09-03 06:59:33 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
packet_set_server(void)
|
|
|
|
{
|
|
|
|
server_side = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
packet_set_authenticated(void)
|
|
|
|
{
|
|
|
|
after_authentication = 1;
|
|
|
|
}
|